Append "shift" to version string in shifted image
Append "shift" to version string in shifted image

For EC update test, we produce binary-wise shifted image. To make it
easier to tell if update has succeeded, let's append "shift" to the
verison in this image.

BUG=chrome-os-partner:10264
TEST=Build shifted image and check the version string.

Change-Id: I16187611cf61fc97a74bc3707a77ad9ad5274f37
Reviewed-on: https://gerrit.chromium.org/gerrit/27577
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-by: Hung-Te Lin <8a7fce4940baad93a69f5073b383c85deed9d9c4@chromium.org>
Commit-Ready: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Tested-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>

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